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Thread: Solved Paper CS601 Data Communication Spring 2009 Final Term

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    28 Solved Paper CS601 Data Communication Spring 2009 Final Term

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    FINALTERM EXAMINATION
    Spring 2009
    CS601- Data Communication


    Time: 120 min
    Marks: 80



    Question No: 1 ( Marks: 1 ) - Please choose one
    Which is not an element of protocol

    ► semantics
    ► timing
    communication service module


    Question No: 2 ( Marks: 1 ) - Please choose one
    Layers 5, 6 and 7 also called as network support layers.


    True
    ► False

    Question No: 3 ( Marks: 1 ) - Please choose one
    Fourier transform tells us that any digital signal can be decomposed into infinite number of periodic signals


    True
    ► False

    Question No: 4 ( Marks: 1 ) - Please choose one
    Time domain plot show changes in signal phase with respect to time.


    True
    ► False

    Question No: 5 ( Marks: 1 ) - Please choose one
    Analog to digital conversion is also termed as modulating an analog signal.


    ► True
    False



    Question No: 6 ( Marks: 1 ) - Please choose one
    DC component is also termed as Direct current component or a component with non-zero frequency.


    ► False
    True



    Question No: 7 ( Marks: 1 ) - Please choose one
    Manchester is a type of ____________encoding.


    biphase
    ► polar
    ► biphase & polar
    ► none of the given



    Question No: 8 ( Marks: 1 ) - Please choose one
    The inversion of the level at 1 bit is called as __________

    ► NRZ-L
    NRZ-I
    ► RZ

    Question No: 9 ( Marks: 1 ) - Please choose one
    PCM is the first process of PAM.


    ► True
    False



    Question No: 10 ( Marks: 1 ) - Please choose one
    In 4PSK each phase change represents ______bits.


    ► 3
    ► 6
    2
    ► 4



    Question No: 11 ( Marks: 1 ) - Please choose one
    In RS 422 Balanced mode two lines carry ________ signals which are not identical to each other.


    same
    ► different
    ► digital
    ► analog



    Question No: 12 ( Marks: 1 ) - Please choose one
    A ______________ converts an analog signal into a digital signal.


    ► Demodulator
    ► Modulator
    ► Digital-to-analog converter

    Question No: 13 ( Marks: 1 ) - Please choose one
    Which of the following is an example of ITU-T modem standards:


    ► T-series
    ► X-series
    ► N-series
    V-series



    Question No: 14 ( Marks: 1 ) - Please choose one
    The maximum data rate in the uploading direction is still ____________.



    ► 26.6 Kbps
    33.6 Kbps
    ► 36.6 Kbps
    ► 46.6 Kbps



    Question No: 15 ( Marks: 1 ) - Please choose one
    Which of the following primarily uses guided media


    ► Cellular telephone system
    Local telephone system
    ► Satellite communication
    ► Radio broadcasting



    Question No: 16 ( Marks: 1 ) - Please choose one
    When a beam of light travels through media of two different densities, if the angle of incidence is greater than the critical angle, ____________occurs.


    Reflection
    ► Refraction
    ► Incidence
    ► Criticism



    Question No: 17 ( Marks: 1 ) - Please choose one
    When we talk about unguided media, usually we are referring to _________.



    ► Metallic wires
    ► Nonmetallic wires
    The air
    ► Water



    Question No: 18 ( Marks: 1 ) - Please choose one
    Optical fibers are defined by the ratio of the ___________ of their core to the diameter of their cladding.


    Diameter
    ► Radius
    ► Length
    ► Width



    Question No: 19 ( Marks: 1 ) - Please choose one
    All of popular Fiber optic connectors are ___________ shaped.


    ► Conical
    Barrel
    ► Circular
    ► Rectangular



    Question No: 20 ( Marks: 1 ) - Please choose one
    Radio wave transmission utilizes ___________ different types of propagation.


    ► Four
    ► Three
    ► Two
    Five



    Question No: 21 ( Marks: 1 ) - Please choose one
    dB is ____________ if a signal is amplified.


    Negative
    ► Positive
    ► Null
    ► Zero



    Question No: 22 ( Marks: 1 ) - Please choose one
    A prism can deflect the light depending upon the angle of ____________ and the frequency.



    Deviation
    ► Incident
    ► Refraction
    ► Reflection



    Question No: 23 ( Marks: 1 ) - Please choose one
    Asynchronous TDM is efficient only when the size of the time slot is kept relatively _______________


    Large
    ► Small
    ► Medium
    ► None of the given



    Question No: 24 ( Marks: 1 ) - Please choose one
    The local loop has ___________ cable that connects the subscriber telephone to the nearest end office.


    Twisted-pair
    ► Coaxial
    ► Fiber-optic
    ► None of the given



    Question No: 25 ( Marks: 1 ) - Please choose one
    Data from a computer are ____________; the local loop handles _________ signals.


    ► Analog; analog
    ► Analog; digital
    ► Digital; digital
    Digital; analog



    Question No: 26 ( Marks: 1 ) - Please choose one
    Which error detection method uses ones complement arithmetic?


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    ► Simple parity check
    ► Two-dimensional parity check
    ► CRC
    Checksum

    Question No: 27 ( Marks: 1 ) - Please choose one
    Flow control is needed to prevent ____________


    ► Bit errors
    Overflow of the sender buffer
    ► Overflow of the receiver buffer
    ► Collision between sender and receiver



    Question No: 28 ( Marks: 1 ) - Please choose one
    ____________ coordinates the amount of data that can be sent before receiving acknowledgment


    ► flow control
    ► error control
    ► data control



    Question No: 29 ( Marks: 1 ) - Please choose one
    Error control is both error _________ and error ___________


    ► detection; correction
    ► detection; deletion
    ► detection; avoidance
    ► detection; forwarding



    Question No: 30 ( Marks: 1 ) - Please choose one
    Addressing is not needed in _______________ configuration.


    ► Point to Point
    ► Multipoint
    ► Point to point and multipoint



    Question No: 31 ( Marks: 1 ) - Please choose one
    In a Go-Back-N ARQ, if the window size is 63, what is the range of sequence number?


    0 to 63
    ► 0 to 64
    ► 1 to 63
    ► 1 to 64



    Question No: 32 ( Marks: 1 ) - Please choose one
    A timer is set when ___________ is sent out.


    ► A data frame
    An ACK
    ► A NAK



    Question No: 33 ( Marks: 1 ) - Please choose one
    Sliding window requires that data frames be transmitted _______________


    Sequentially
    ► Frequently
    ► Synchronously
    ► Asynchronously



    Question No: 34 ( Marks: 1 ) - Please choose one
    In Y-MODEM Multiple files can be sent simultaneously


    True
    ► False



    Question No: 35 ( Marks: 1 ) - Please choose one
    BLAST stands for :


    Blocked asynchronous transmission
    ► Blocked synchronous transmission
    ► Barrel asynchronous transmission
    ► Below asynchronous transmission



    Question No: 36 ( Marks: 1 ) - Please choose one
    HDLC is an acronym for ______________.


    ► High-duplex line communication
    High-level data link control
    ► Half-duplex digital link combination
    ► Host double-level circuit



    Question No: 37 ( Marks: 1 ) - Please choose one
    The HDLC ___________ field defines the beginning and end of a frame.



    Flag
    ► Address
    ► Control
    ► FCS


    Question No: 38 ( Marks: 1 ) - Please choose one
    _________ is the access protocol used by traditional Ethernet.


    CSMA/CD
    ► CSMA/CA
    ► Token Ring
    ► CSMA



    Question No: 39 ( Marks: 1 ) - Please choose one
    Bridges can divide a large ________ into smaller segments


    Network
    ► Packet
    ► Frame
    ► Address



    Question No: 40 ( Marks: 1 ) - Please choose one
    Like VRC, LRC and CRC, Checksum is also based on _______________.


    Redundency
    ► Decimal Division
    ► Encryption
    ► Encoding



    Question No: 41 ( Marks: 2 )
    What are the conditions for the polynomial used by the CRC generator?

    CRC generator:

    CRC generator (the divisor) is most often represented not as a1’s and 0’s but as an algebraic polynomial.
    conditions for the polynomial:
    it should have following properties:
    It should not be divisible by “x”.
    It should not be divisible by “x+1”.
    The first condition guarantees that all burst error of a length equal to degree of the polynomial is detected.
    The 2nd condition guarantees that all burst error affecting an odd number of bits are detected.


    Question No: 42 ( Marks: 2 )
    What are intelligent modems?
    Intelligent modems:


    A modem that responds to commands and can accept new instructions during online transmission. It was originally developed by Hayes.
    Example:
    • Automatic answering,
    • Dialing etc.

    Question No: 43 ( Marks: 2 )
    What is the basic purpose of Router?

    Basic purpose of Router:

    "A router is a device that extracts the destination of a packet it receives, selects the best path to that destination, and forwards data packets to the next device along this path. They connect networks together;
    a LAN to a WAN for example, to access the Internet.
    "A more precise definition of a router is a computer networking device that interconnects separate logical subnets."

    Question No: 44 ( Marks: 3 )
    What are the fractional T Lines?

    The fractional T Lines:

    Many subscribers don’t need the entire capacity of the T-line.
    For example,
    A small business may need only one-fourth of the capacity of T-line. if four business of same size lie in the same building, they can share T-line.DSU/CSU allow the capacity of T-line to be interleaved in to four channels


    Question No: 45 ( Marks: 3 )
    What are the light sources used for optic fiber?


    • light sources used for optic fiber:
    • The light source can weather be an LED or ILD
    • LED (Light emitting diode) cheaper but provide unfocused light that strikes the boundaries of channel at uncontrollable angles.
    • Limited to short distance use.
    • LASSER
    • Can be focused to a narrow range allowing control over angle of incidence.


    Question No: 46 ( Marks: 3 )
    What is Multi Access Unit (MAU) in Token Ring?
    Multi Access Unit (MAU) in Token Ring:

    • Individual automatic switches are combined in to a hub
    • One MAU can support up to 8 stations.
    • Although it looks like a star, it is in fact a ring.



    Question No: 47 ( Marks: 5 )
    Give characteristics of Dual Ring, if necessary then draw the diagram. [5]

    Characteristics of Dual Ring:

    A network topology in which two concentric rings connect each node on a network instead of one network ring that is used in a ring topology. Typically, the secondary ring in a dual-ring topology is redundant. It is used as a backup in case the primary ring fails. In these configurations, data moves in opposite directions around the rings. Each ring is independent of the other until the primary ring fails and the two rings are connected to continue the flow of data traffic.


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    Question No: 48 ( Marks: 5 )
    What the receiver will receive if the checksum method is applied to the following
    bit.
    10101001 00111001

    Ans:

    the receiver will receive the checksum method is applied to the following bit.
    10101001 00111001
    10101001 00111001
    Sum of 2 bits are
    10101001
    00111001
    -------------------
    11100010
    00011101 1's complement
    1
    --------------
    00011110 2's complement
    -----------
    10101001 00111001 ==> 00011110

    So the data transmitted which will receiver get:
    10101001 00111001 00011110

    Question No: 49 ( Marks: 5 )
    What is rafraction in terms of optic fiber? Give one example.

    Refraction:

    Light travels in a straight line as long as it is moving through a single uniform structure If a ray of light traveling through one substance enters another (more or less dense) substance, its speed changes abruptly causing the ray to change direction. This phenomenon is called Refraction.

    Refraction in terms of optic fiber:

    the propagation of light in an optical fiber which in its simplest form consists of a circular core of uniform refractive index surrounded by a cladding of slightly lower refractive index. The light is launched into the entrance face of the fiber.
    The light is propagated by the total internal reflection at the interface between core and cladding. However the rays incident at angles larger than a certain angle, called the cut-off angle, suffer both refraction and reflection at the interface between the core and the cladding.
    They, therefore, are not guided. Due to this the optical fiber has a numerical aperture. The numerical aperture is given by the square root of (n12-n22). Typical values of numerical aperture lie between 0.1 and 0.3.

    The refractive indices of the core and the cladding are n1 and n 2 respectively. The fiber is normally in air (n0=1) but could also be in a medium of refractive index n0.



    Question No: 50 ( Marks: 10 )
    What are the asynchronous protocols in data link layer? Discuss in detail with examples. [10 marks]
    Asynchronous protocols in data link layer:

    Asynchronous communication at the data link layer or higher protocol layers is known as statistical multiplexing or packet mode communication,
    For example :
    Asynchronous transfer mode (ATM). In this case the asynchronously transferred blocks are called data packets,
    Async protocols in Data link layer is called statistical multiplexing. for example ATM cells.
    The opposite is circuit switched communication, which provides constant bit rate, for example ISDN and SONET/SDH.
    The packets may be encapsulated in a data frame, with a frame synchronization bit sequence indicating the start of the frame, and sometimes also a bit synchronization bit sequence, typically 01010101, for identification of the bit transition times. Note that at the physical layer, this is considered as synchronous serial communication.
    Examples of packet mode data link protocols that can be/are transferred using synchronous serial communication are the
    • HDLC,
    • Ethernet,
    • PPP and
    • USB protocols.
    Last edited by viki; 07-21-2010 at 02:38 PM.
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  2. #2
    Senior Member viki's Avatar Users Flag!
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    28 Here are some more solved Final Term Paper of CS601

    Solved Final Term Paper of CS601
    Attached Files
      Please register or login to download the attachments.
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    AOA
    if everyone have the past paper of cs601 please send me

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    Dear fellow you just can download them from this website. No one is going to send you an email.

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